Scraper



May 10, 1932. R. e. LE TouRriEAu SCRAPER Filed Jan. 5, 1931 3 Sheets-Sheet l y 1932- R. G. LE TbuR'NEAu I 1,857,157

SCRAPER Filed Jan.- 5, 1931 3 Sheets-Sheet 2 R. Le Tourneau,

Q0? mm ATTO R N EY R cs. LE TouRNEAu 1,857,157

May 10, 1932.

S GRAPER Filed Jan. 5, 1931 3 Sheets-Sheet 3 INVENTOR R. 6 .1? Thug-mean,

Q Q I ATTORNEY Patented Ma 10. 1932 PATENT OFFICE ROBERT G. LE TOURNEAU, F STOCKTON, QALIFORNIA scmim Application filed January 5, 1831. Serial No. 506,521.

This invention relates to scrapers of the wheel supported and large capacity type, and particularly to such scrapers in which the discharge of the load is effected by moving the back plate or endgate of the bowl of the scraper forwardly, so that the load is ositioned over the front end of the bowl. trutures having this feature are.shown for instance-in my Patents Nos. 1,530,779 dated March 24, 1925, and 1,598,864 dated September 7 1926.v

The principal objects of my present invention are to provide what I believe to be a novel mechanism for controlling the movement of the endgate, and also a'novel mechanism for controlling the raising and lowering of the rear supporting wheels of the scraper, which determines the level of the bowl and consequently governs the position of the same for loading ordirt conveying purposes. 1

These objects I accomplish-by means of such structure and relative arrangement of parts as will fully appear by a perusal of the following specification and claims.

In the drawings similar characters of referenceindicate corresponding parts in the several views:

Fig. 1. is side elevation of my improved scraper shown in its loaded position.

Fig. 2-is a similar view showing the bowl in its carrying position.

Fig. 3 is a top plan view of the scraper.

Fig. 4 is a fragmentary enlarged longiendgate partly advanced.

Fig. 5 is a fragmentary section of the main frame beam of the scraper showing the frontend mounting of the endgate controlling spring.

Referring now more particularly to the characters of reference on the drawings, the numeral 1 denotes the longitudinally extending main frame beam of the scraper-a straight rigid member of hollow box section. A post 2 of similar nature depends from the forward end of the beam and is supported by a swivelly mounted truck 3 from which a tongue 4 extends forwardly for connection to a tractor.

tudinal section of the scraper showing the A tension bar 9 extends between the beam 8 and the blade centrally of the ends of the latter to hold the same against downward deflection. The bowl and beam 1 are additionally connected together so as to be maintained in ri 'd unitary association by diagonal forwar 1 angled beams 10 extending between the si e plates and the beam 1 ahead of the cross beam. The back end of the bottom plate is reinforced by a cross-beam 11 under the same, from the ends of which short arms 1 12 project upwardl and rearwardly. On their upper ends t ese arms have pivotal connectlon with rearwardly and upwardly projecting members 13 which are connected wardly of the bowl. Arms 15 depend rearwardly and downwardly from the beam 14 intermediate its ends and form supports for the spindles or axles of the rear wheels 16' of the scra er.

A rigid ever 17 pro ects upwardly from the beam 14 to one side of the beam 1 and has a forwardly extending bar 18 ivoted on its upper end. This bar 1s dispose above the plane of the beam 1 and pro ects forwardly to one side of. the same to a termination ahead of the bowl. A multiple sheave block 19 is rigidly secured to the under side of the bar at its forward end, this block being associated with a roller 20 which rides on a rail 21. This rail is fixed in parallel connection with the beam 1 to one side of the same and ahead of the beam 8, the en gagement of the roller with the rail bemg maintained by the weight of the bar.

to a common cross-beam 14 disposed reara A cable 22 is anchored at one end on the a casing of a multiple sheave block 23 which is rigidly secured on the beam 8 in longitudinal alinement with the block 19. The cable "extends'thence back and forth between the blocks 23-and 19 over the various sheaves and thence forwardly and over a sin 1e sheave 24. This latter sheave is swivelly mounted on the outer end of a cross arm 25 which is fixed in connection with and above the beam 1 at its forward end. I From the sheave 24 the cable extends to a winding drum on the tractor, this drum being preferably mounted in connection with a power unit of the type shown in my copending application for patent, Serial No. 512,979, filed February 2, 1931.

By reason of this arrangement it will be seen 'that a pull on the cable draws the sheave block 19 and consequently the bar 18 rearwardly. This exerts a rearward push on the lever 17, causing the wheel su porting arms 15 to be depressed and thus Powering the wheels relative to the bowl against the resistance offered by the weight of the latter and its load. With this position of the wheels the bowl will obviously be raised clear of the ground a certain distance depending on the extent to which the bar 18 has been forced rearwardly. The block 23 is disposed on a level below that of the block 19, so that a pull on' the cable exerts a downward pressure on the bar and aids in holding the roller engaged with its rail. Upon the winding drum to which the control cable 22 is attached being released, the weight of the parts causes the wheels to be relatively raised and the bowl lowered as will be evident, thus avoidin any undue slack of the cable being had wit such release of the drum.

The back of the bowl is in the form of a vertical plate 26 unattached to the side plates, and braced by upright beams 27 and a crossbeam 28 near the bottom and to which said uprights are connected.

The uprights extend past the beam 1 adj acent the opposite sides of the same and are rigidly connected to a supporting carriage 30 disposed above said beam. This carriage has rollers 31 engaging the top surface of the beam and to the rollers 32 engaging the sides of the beam, so that said carriage may travel with a minimum of friction and with notendency to stick. An additional roller 33 extends between and is supported by the uprights 27 and engages the under face of the beam 1.

The uprights are connected to the carriage ad acent its rear end and diagonal beams '34 extend between the carriage toward its forward end and the uprights 27 intermediate their ends. A multiple sheave block 35 is rigidly mounted on the carriage at its front end, while a similar block 36 is mounted on the main beam 1 some distance in front. A cable 37 is anchored at one end on the casing of the block 35 and extends thence hack and forth between said block and the block 36 and over the various sheaves. The cable then extends forwardly to and over av single sheave 38 which is swivelly hung from the opposite with a pull on said cable the carriage and the endgate will be drawn forwardl thereby effecting the discharge of the loa from the forward end of the bowl. The endgate does not of course tend to return of itself to its normal position at the back of the bowl, and

to automatically return the endgate to such position when the winding drum is released. and without any undue slack of the control cable being had I provide the following means Mounted in the main beam 1 is a longitudinally extending compression spring 39. The rear end of the spring abuts against the rear end closure of the main beam, while its forward end bears against ,a head 40 slidable in the beam. A cable 41 is attached to this head and extends thence inside the coils of the spring to the rear end of the beam and thence over a sheave 42 fixed in connection with said beam at its rear end beyond the spring. Passing about and under the sheave the cable is attached to the endgate adjacent its upper end or just below theroller 33, as shown in Fig. 4. It will thus be seen that when the endgate is drawn forwardly the spring is placed under compression. When part such movement to the endgate against the inevitable drag ofthe cable and that caused by the weight of the gate itself.

From the foregoing description it will be readily seen that I have produced such a device as substantially fulfills the objects of the invention'as set forth herein.

While this specification sets forth in detail the present and preferred construction of the device. still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit of the invent on, as-defined by the appended claims.

Having thus described my invention what Iclaim as new and useful and desire to secure by Letters Patent is:

1. A scraper comprising a bowl having side plates and a bottom plate, an endgate for 'the bowl, disposed between the side plates. means mounting said endgate for movement lengthwise of the bowl and parallel to the bottom plate, a longitudinal beam rigid with and above the bowl. a carriage supported on the beam for movement along the same. rigid connections between the carriage and endgate whereby the latter forms a rigid unit with the carriage, means applied to the carriage to pull the same forof the engate, and means between the .endga-te I and spring to compress the latter when the endgate is pulled forwardly, whereby when the pulling pressure is released, the spring will act to retract the engate.

'2. A scraper comprising a bowl having side plates and a bottom plate, an endgate for the bowl, disposed between the side plates, means mounting said endgate for movementlengthwise of the bowl and par allel to the bottom plate, a longitudinal beam rigid with and above the bowl, a carriage rigid with the endgate and slidably supported on the beam, a sheave block secured on the forward end of the carriage, anotlier sheave block secured on the beam ahead of the carriage, and a cable anchored on one block and extending thence back and forth over the c sheaves of the blocks and then forwardly of and beyond the beam for. connection to a winding drum.

3.'In a scraper, a bowl, a transverse beam behind the same, means pivotally supporting the beam from" the bowl, arms rigid with, and projecting rearwardly from the beam,

wheels supported on-the rear ends of the arms, a leverlrigid with and upstandingfrom the beam. a bar connected to the upper end of the lever and extending thence forwardly, and means applied to the bar for pushing the same rearwar'dly. 4. In a scraper, a bowl, a transverse beam behind theqsame, means pivot'ally supporting the beam from the'bowl. arms rigid with and projecting rearwardly. from the beam,

wheels supported on the reayends of the arms. a lever rigid with and upstanding from the beam, a bar connected to the upper-end of the lever and extending thence forwardly.

6; TA scraper comprising'a bowl and end-- the beam and directly applied tothe'carriage to pull the same along the beam.

In testimonfi whereof I aflix my signature. ROBERT-G. LE, TOURNEAU.

a horizontal rail extending lengthwise of and I under the bar, a member on the forward end 1 of the barengaging the rail, and meansappliedto the bar to push the same rearwardly andto also exert a downward pressure .on the iorward end of the ban. 1 q p 5. A scraper comprising aebowl and endgate for the bowl. means mounting-said end gate for movement-endwise of the bowha hollow longitudinal beam rigid with and above the bowl. a carriage supported on the a beam for movemenhalong the same, rigid connections between the carriage and endgate whereby the latterformsa rigid unit with the connectionwith the head.

carriage, means applied to the carriage to pull; the. same "forwardly, a compression spring enclosed in; the beam ahead of the\ 'endgate; the rear end of; the spring being held against movement, a head movable along the beam and engaged by the forward .end of the spring, asheave mounted on the beam rearwardly of the endgate and spring and a flexible memberconnected at one end to the endgate' and extending thence to and about the sheave and along'the spring to a 

